drm/nouveau/kms/nv50-: Don't allow inheritance of headless iors

Turns out we made a silly mistake when coming up with OR inheritance on
nouveau. On pre-DCB 4.1, iors are statically routed to output paths via the
DCB. On later generations iors are only routed to an output path if they're
actually being used. Unfortunately, it appears with NVIF_OUTP_INHERIT_V0 we
make the mistake of assuming the later is true on all generations, which is
currently leading us to return bogus ior -> head assignments through nvif,
which causes WARN_ON().

So - fix this by verifying that we actually know that there's a head
assigned to an ior before allowing it to be inherited through nvif. This
-should- hopefully fix the WARN_ON on GT218 reported by Borislav.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Reported-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231214004359.1028109-1-lyude@redhat.com

drm/nouveau/kms/nv50-: create outputs based on nvkm info

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-44-lyude@redhat.com

drm/nouveau/disp: add dp mst id get/put methods

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-36-lyude@redhat.com

drm/nouveau/disp: add dp sst config method

This is presently unused on HW, we read a bunch of regs and calculate
the watermark during the second supervisor interrupt.

I don't want to change this yet as I need to re-remember how older HW
works exactly, but RM wants this info via RPC.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-35-lyude@redhat.com

drm/nouveau/disp: move link training out of supervisor

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-34-lyude@redhat.com

drm/nouveau/disp: add dp train method

- passes DPCD information from DRM to NVKM
- removes NVKM's own sink caps handling
- link still trained from supervisor, more patches to come

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-33-lyude@redhat.com

drm/nouveau/disp: add dp rates method

- moves building of link rates table from NVKM to DRM
- preparing to move link training out of supervisor

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-29-lyude@redhat.com

drm/nouveau/disp: add dp aux xfer method

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-28-lyude@redhat.com

drm/nouveau/disp: move dp aux pwr method to HAL

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-27-lyude@redhat.com

drm/nouveau/disp: add hdmi audio hal function

This just adds a hook for RM to use, HW paths remain untouched, but
should probably be cleaned up to use this too at some point.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-26-lyude@redhat.com

drm/nouveau/disp: add output lvds config method

- was previously part of acquire()

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-25-lyude@redhat.com

drm/nouveau/disp: add output backlight control methods

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-24-lyude@redhat.com

drm/nouveau/disp: release outputs post-modeset

Prior to this commit, KMS would call release() prior to modeset, and the
second supervisor interrupt would update SOR routing if needed.

Now, KMS will call release() post-modeset and update routing immediately.

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-22-lyude@redhat.com

drm/nouveau/disp: move hdmi disable out of release()

- release() is being moved post-modeset, preserve hdmi behaviour for now

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-21-lyude@redhat.com

drm/nouveau/disp: add output hdmi config method

- was previously part of acquire()
- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-20-lyude@redhat.com

drm/nouveau/disp: update SOR routing immediately on acquire()

- was previously delayed until second supervisor interrupt

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-15-lyude@redhat.com

drm/nouveau/disp: add acquire_sor/pior()

- preparing to move protocol-specific args out of acquire() again
- avoid re-acquiring acquired output, will matter when enforced later
- sor/pior done at same time due to shared tmds/dp handling

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-14-lyude@redhat.com

drm/nouveau/disp: add acquire_dac()

- preparing to move protocol-specific args out of acquire() again
- avoid re-acquiring acquired output, will matter when enforced later
- this one is basically just a rename

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-13-lyude@redhat.com

drm/nouveau/disp: shuffle to make upcoming diffs prettier

- preparing to move protocol-specific args out of acquire() again
- no code changes

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-12-lyude@redhat.com

drm/nouveau/kms: Add INHERIT ioctl to nvkm/nvif for reading IOR state

Now that we're supporting things like Ada and the GSP, there's situations
where we really need to actually know the display state that we're starting
with when loading the driver in order to prevent breaking GSP expectations.
The first step in doing this is making it so that we can read the current
state of IORs from nvkm in DRM, so that we can fill in said into into the
atomic state.

We do this by introducing an INHERIT ioctl to nvkm/nvif. This is basically
another form of ACQUIRE, except that it will only acquire the given output
path for userspace if it's already set up in hardware. This way, we can go
through and probe each outp object we have in DRM in order to figure out
the current hardware state of each one. If the outp isn't in use, it simply
returns -ENODEV.

This is also part of the work that will be required for implementing GSP
support for display. While the GSP should mostly work without this commit,
this commit should fix some edge case bugs that can occur on initial driver
load. This also paves the way for some of the initial groundwork for
fastboot support.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-11-lyude@redhat.com

drm/nouveau/disp: rename internal output acquire/release functions

These will be made static later in the patch series, after the code that
uses them has been cleaned up in preparation for GSP-RM support.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-10-lyude@redhat.com

drm/nouveau/disp: add output method to fetch edid

- needed to support TMDS EDID on RM

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-9-lyude@redhat.com

drm/nouveau/disp: add output detect method

This will check the relevant hotplug pin and skip the DDC probe we
currently do if a display is present.

- preparation for GSP-RM.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-8-lyude@redhat.com

drm/nouveau/disp: rearrange output methods

- preparation for a bunch of API changes, to make diffs prettier

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Acked-by: Danilo Krummrich <me@dakr.org>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230919220442.202488-7-lyude@redhat.com

drm/nouveau/disp: More DP_RECEIVER_CAP_SIZE array fixes

More arrays (and arguments) for dcpd were set to 16, when it looks like
DP_RECEIVER_CAP_SIZE (15) should be used. Fix the remaining cases, seen
with GCC 13:

../drivers/gpu/drm/nouveau/nvif/outp.c: In function 'nvif_outp_acquire_dp':
../include/linux/fortify-string.h:57:33: warning: array subscript 'unsigned char[16][0]' is partly outside array bounds of 'u8[15]' {aka 'unsigned char[15]'} [-Warray-bounds=]
57 | #define __underlying_memcpy __builtin_memcpy
| ^
...
../drivers/gpu/drm/nouveau/nvif/outp.c:140:9: note: in expansion of macro 'memcpy'
140 | memcpy(args.dp.dpcd, dpcd, sizeof(args.dp.dpcd));
| ^~~~~~
../drivers/gpu/drm/nouveau/nvif/outp.c:130:49: note: object 'dpcd' of size [0, 15]
130 | nvif_outp_acquire_dp(struct nvif_outp *outp, u8 dpcd[DP_RECEIVER_CAP_SIZE],
| ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 813443721331 ("drm/nouveau/disp: move DP link config into acquire")
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Lyude Paul <lyude@redhat.com>
Cc: Karol Herbst <kherbst@redhat.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Airlie <airlied@redhat.com>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <git@karolherbst.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230204184307.never.825-kees@kernel.org

drm/nouveau/disp: fix incorrect/broken hdmi methods

These are fixes from Lyude, and were meant to have been included in the
last round of drm-next patches.

- Fix some nasty memory issues that broke Lyude's display:
- 0 initialize both nvif args and parsed HDMI infoframe buffers
- Fixed missing memset(…, 0, …) for nvif args before sending VSI
infoframe
- Fixed incorrect data pointer and size in nvkm_uoutp_mthd_infoframe()
(was previously pointing at the start of the nvif_outp_infoframe_args
struct instead of at the start of the infoframe data
- Get rid of duplicated scdc assignments, since we only use it to write the
scdc registers

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drm/nouveau/disp: move DP MST payload config method

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: add method to trigger DP link retrain

This moves control of link retraining in response to HPD IRQ to the
KMS driver's HPD IRQ handler.

NVKM still handles checking link status for the moment, this can be
moved to the KMS driver when it takes explicit control of link rate
selection.

v2:
- skip source config on retrain (fixes some retrain failures)

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: add method to control DPAUX pad power

This removes the need for NVKM to track DP HPD events, as the KMS
driver follows them already, and has better information available.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move DP link config into acquire

Aside from fixing MST->SST switching (KMS never turned off MST link config),
this should preserve existing behaviour for the moment, but provide a path
for the KMS driver to have more explicit control of the DP link, which has
been requested by Lyude.

More research into modeset/supervisor interactions is needed before we can
have fully explicit control from the KMS driver.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move HDA ELD method

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move HDMI config into acquire + infoframe methods

v2:
- fix typo in sorhdmi/g84 struct initialiser (kbuild test robot)
v3:
- less convoluted flow control in nvkm_uoutp_mthd_acquire_tmds() (lyude)
v4:
- we don't support hdmi on original nv50, don't try

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move LVDS protocol information into acquire

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move and extend the role of outp acquire/release methods

There are various pieces of information we pass to NVKM about the next
modeset, which are generally used while handling supervisor interrupts.

We had to start passing in some information about audio requirements a
while back to allocate an appropriate SOR in ACQUIRE, so we may as well
move all this type of information here for other protocols too.

Certain methods will be blocked on non-acquired outputs now, preventing
NULL pointer derefs from KMS driver bugs.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/disp: move DAC load detection method

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drm/nouveau/disp: add output class

Will be used to more cleanly implement existing method interfaces that
take some confusing (IEDTkey, inherited from VBIOS, which RM no longer
uses on Ampere) match values to determine which display path to operate
on.

Methods will be protected from racing with supervisor, and from being
called where they shouldn't be (ie. without an OR assigned).

v2:
- use ?: (lyude)
v3:
- fix return code if noacquire() method fails

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>